chore: initialize project scaffold

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

requirements.txt

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+# Editable Git install with no remote (ai-chat-exporter==0.1.0)
+-e /home/jesse/services/ai-chatexport
+certifi==2026.2.25
+charset-normalizer==3.4.4
+click==8.1.7
+idna==3.11
+iniconfig==2.3.0
+markdown-it-py==4.0.0
+mdurl==0.1.2
+packaging==26.0
+pluggy==1.6.0
+Pygments==2.19.2
+PyJWT==2.8.0
+pytest==8.1.1
+pytest-mock==3.14.0
+python-dotenv==1.0.1
+python-slugify==8.0.4
+PyYAML==6.0.3
+requests==2.31.0
+responses==0.25.3
+rich==13.7.1
+setuptools==82.0.0
+text-unidecode==1.3
+urllib3==2.6.3
+wheel==0.46.3